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J. Korean Ceram. Soc. > Volume 25(5); 1988 > Article
Journal of the Korean Ceramic Society 1988;25(5): 502.
$alpha$-질화규소 Whisker의 $alpha$/$beta$ 상변태
박지연, 김종희
한국과학기술원 재료공학과
$alpha$ to $beta$ Phase Transformation of $alpha$-Si3N4 Whisker
ABSTRACT
The $alpha$ to $beta$ phase transformation of $alpha$-Si3N4 whisker and related microstructural changes have been investigated. When only $alpha$-Si3N4 whisker was heat treated in the range 1650~175$0^{circ}C$, the $alpha$ to $beta$ phase transformation occured. In this case, it eas suggested that the oxygen content in $alpha$-Si3N4 whisker affected the transformation behavior. Although $alpha$-Si3N4 whisker with Si was heat treated under the same condition, however, the variation of $beta$- fraction had a similar tendency with heat treating time. Therfore, it was considered that the oxygen content in $alpha$-Si3N4 whisker affected the transformation behavior dominently rather than the content of added Si. The added $beta$ phase did not affect the transformation behaviro of $alpha$-Si3N4 whisker.
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